William thoenbuegh



(No ModeL W. THORNBURGH.

GRINDSTONE FRAME.

Patented Nov. 15, 1887;

' WITNESSES ATTORNEYS.

N. Penn's. Fhakirhlhognpher. wmimm u. c.

UNITED STATES PATENT Orricn.

WILLIAM THORNBURGH, or ELYRIA, OHIO.

GRINDSTONE-FRAME.

SPECIFICATION forming'part of Letters Patent No. 373,254, dated November15, 1887,

Application filed January 26, 1887. Serial No. 225,552.

l and combinations of the same, as will be fully described hereinafter,and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of my improvement. Fig. 2 is a vertical,cross-section of the same, on an enlarged scale, on the line it w ofFig. 1. Fig. 3 is a perspective View of the clamp, on an enlarged scale.Fig. 4 is a perspective view of the wedge, on an enlarged scale; andFig. 5 is a perspective view of one end of a side bar.

The grindstone-frame A is provided with two sets of legs, B, whichsupport the side bars, 0. Each set of legs Bis united with the sidebars, 0, by means of a clamp, D, a wedge, E, and a bolt, F. The clamp D,preferably of metal, is formed in the shapeof a casing having open ends,and in its bottom a transverse slot, D which is enlarged in the middle.A square aperture, D, is formed on the top of the clamp D, and throughit passes the square part of the bolt F, which is thus prevented fromturning.

The wedge E is preferably of metal, and is formed in the shape of acasing. This wedge fits into the middle portion of the slot D, and isprovided with the inclined sides E E, having flanges E. In the bottom ofthe wedge E is an aperture, E through which passes snugly the lowerthreaded end of the bolt F,

and the top of the wedge has a large open- The side bars, 0, carrybearings of any approved construction, in which the grindstone isjournaled. Each outer end of each side (No model.)

the legs B, with its inclined sides E" resting against the inner edgesof the legs B, while the flanges E prevent endwise motion of the wedgeE. The bolt F isthen inserted through the top aperture, D, of the clampD, and passes through the openings E and E* in the wedge E, and then thenut G is screwed on the threaded end of the bolt F and against thebottom of the wedge E, so that the latter is drawn upward and forces thelegs B and the side bars, 0, tightly in position in the clamp D, asshown in Fig. 2. p

The grindstone frame can be easily knocked down by unscrewing the nut Gand removing the wedge E, after which the legs B and the side bars, 0,can be easily removed from the clamps. D.

Having thus fully described my invention, I

claim as new and desire to secure by Letters Patent- 1. In agrindstone-frame, the combination, with the side bars and legs, of aclamp having openings in its bottom and sides, into which fit the endsof the said side bars and legs, a vertically-movable wedge fitting onthe inside edges of the legs, and a bolt and nut for hold- 3. In agrindstoneframe, the side bars, 0,

having a recess near each end, and the legs B, in combination with theclamps D, each having a transverse slot, D enlarged in the mid die, andalso the aperture D, the wedge E, provided with inclined sides E, havingflanges E, the wedge being also provided with an apertured top andbottom, the bolt F, and the nut G, screwing on the said bolt and againstthe bottom of the said Wedge, substantially as shown and described.

4. In a grindstone-frame, the clamp formed of a casting, D, having sideopenings, an angular aperture, D, in itstop, and the longitudinal slot Din its bottom, enlarged at its center, substantially as set forth.

5. Inagrindstoneframe, the bindingwedge E, having apertures E" E in itstop and base, respectively. and flanges E" at its opposite inclinededges, substantially as set forth.

6. A clamp and binding-wedge for grindstone-frames, comprising thecasting D, having angular aperture D in its top, side open ingsandcentrally-enlarged slot D in its bottom, and the Wedge E, havingapertures E E in its top and bottom, and side flanges, E", and the boltF, extending down through apertures D EB and having a nut, G,substantially as set forth.

WILLIAM THORNBURGH.

WVitn esses:

CHAS. W. PURPLE, GEO. P. METCALF.

